Establish safe working procedures for all areas of operation in coordination with the safety department and ensure its implementation to keep accident to the minimum and reduce downtime.

建立安全的工作程序，各个领域的行动中的协调与安全署并 确保其执行，以保持意外到最低限度，并减少停机时间。

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The structure of the air traffic control areas is tightly related with the organization structure, operation mechanism of ATM system and the coordination between civil aviation and military.

空中交通管制区域的结构与空中交通管理系统的组织结构、运行机制和军民航协调等方面内容密切相关。

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Therefore, the stage difference coordination problem with the operation of DC system has become a key issue.

因此，级差配合问题就成为直流系统运行中一个比较关键的问题。

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Ricardo Alday, a spokesman for the Mexican Embassy in the United States, also said the drone belonged to Mexico and was part of an operation in coordination with the U.S. government.

CNN: Drone crash in El Paso under investigation